<template>
    <div>
        <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                v-model="selectCateKeys"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-col>
        </el-row>

        <!-- tab 页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTabData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染Tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini"  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTabData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染Tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)" >编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            //级联选择框双向绑定的数组
            selectCateKeys: [],
            //被激活的页签的名称
            activeName: 'many',
            //动态参数的数据
            manyTabData: [],
            //静态参数的数据
            onlyTabData: [],
            //控制添加对话框的显示与隐藏
            addDialogVisible: false,
            //添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            //添加表单的验证规则对象
            addFormRules: {
                attr_name: [{
                    required:true,message:'请输入参数名称',trigger:'blur'
                }]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible: false,
            //修改的表单数据对象
            editForm:{},
            //修改表单的验证对象规则
            editFormRules:{
                attr_name: [{
                    required:true,message:'请输入参数名称',trigger:'blur'
                }]
            },
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有的商品分类列表
        async getCateList(){
            const { data: res } = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败！')
            }

            this.catelist = res.data

            console.log(this.catelist)
        },
        //级联选择框选中项变化会触发此函数
        handleChange(){
            this.getParamsData()
        },
        //tab 页签点击事件的处理函数
        handleTabClick(){
            console.log(this.activeName)
            this.getParamsData()
        },
        //获取参数的列表数据
        async getParamsData(){
            //证明选中的不是三级分类
            if(this.selectCateKeys.length !== 3){
                this.selectCateKeys = []
                this.manyTabData = []
                this.onlyTabData = []
                return
            }
            //证明选中的是三级分类
            console.log(this.selectCateKeys)
            //根据所选分类的id，和当前所处的面板，获取对应的参数
             const { data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params: { sel: this.activeName}
            })
            if(res.meta.status !== 200){
                return this.$message.error('获取参数列表失败！')
            }
            

            res.data.forEach(item =>{
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                //控制文本框的显示与隐藏
                item.inputVisible = false
                //文本框中输入的值
                item.inputValue = ''
            })
            
            console.log(res.data)

            if(this.activeName === 'many'){
                this.manyTabData = res.data
            }else{
                this.onlyTabData = res.data
            }
        },
        //监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid) return 
                const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
            })
            if(res.meta.status !== 201){
                return this.$message.error('添加参数失败！')
            }
            this.$message.success('添加参数成功！')
            this.addDialogVisible = false
            this.getParamsData()
        })
        },
        //点击按钮展示修改对话框
        async showEditDialog(attrId){
            //查询当前参数的信息
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`,{
                params:{ attr_sel: this.activeName }
            })
            if(res.meta.status !== 200){
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        //重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 200){
                    return this.$message.error('修改参数失败！')
                }
                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        //根据id删除独影的参数项
        async removeParams(attrId){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err => err)

        //用户取消了删除的操作
        if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除！')
        }

        //删除的业务逻辑
        const{ data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)

        if(res.meta.status !== 200){
            return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
        },
        //文本框失去焦点或摁下Enter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            //如果没有return 则证明输入的内容需要做后续的处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            //需要发起请求，保存这次操作
            this.saveAttrVals(row)
        },
        //将对 attr_vals 的操作保存到数据库
        async saveAttrVals(row){
            //需要发起请求，保存这次操作
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
        //点击按钮展示文本输入框
        showInput(row){
            row.inputVisible = true
            //文本框自动获得焦点
            //$nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed: {
        //如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            return this.selectCateKeys.length !== 3 ? true : false
        },
        //当前选中的三级分类的id
        cateId(){
            if(this.selectCateKeys.length === 3){
                return this.selectCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    },
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
} 
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>